Zinc-iron alloy plate is also called alloyed galvanized plate. The alloying process heats the galvanized strip through the alloying furnace to 550~560 ° C in 5~10 seconds in order to convert the pure zinc layer into an iron-zinc alloy. Its weldability, coating performance, heat resistance, corrosion resistance are better than ordinary galvanized sheet.

Performance and characteristics

1. Suitable for alkaline low iron zinc iron alloy process, coating iron content 0.3 ~ 0.8%;

2. Fine crystal coating, brightness is white;

3. The alloy coating is easy to passivation, and the corrosion resistance of the alloy coating after passivation is more than three times that of the zinc layer passivation;

4. Stable plating solution, easy to maintain, can be hung plating or roll plating (including automatic line);

5. The cost is relatively low, and the original equipment can be used to turn the original zincate galvanizing liquid into a trough.

Use

By alloying, it can be made into superalloy or super alloy, corrosion resistant alloy, high resistance alloy, electric vacuum alloy and other materials with special properties. Widely used in aerospace, aviation, shipbuilding, electronics, electrical, machinery, chemical, electroplating and other industrial sectors.

In the early days, there were more zinc-iron alloys in automobiles, such as gasoline pumps, carburetors, and so on.

Because the surface galvanized liquid contains iron, so the welding performance is better than ordinary galvanized, also has rust resistance and corrosion resistance, the application is very wide.

First, will galvanized steel rust

1. Galvanized steel sheet will rust, according to the different environment of galvanized steel sheet, the reaction is not the same, if the galvanized steel sheet is placed outdoors for a long time, galvanized steel sheet will rust, if the galvanized sheet is placed indoors, and keep dry, do not let the galvanized steel sheet with water stains and corrosion liquid, then the galvanized sheet rust time will also be extended.

2. Galvanized steel plate corrosion and rust is a normal phenomenon, because the galvanized steel plate contains other impurities, such as iron and zinc and other metals, this is easy to produce corrosion effect, resulting in galvanized sheet rust.

3. Although the galvanized steel plate has a certain corrosion resistance and rust resistance, the ability of the galvanized steel plate is limited, if it is placed in a harsh environment for a long time, all the steel plates will rust.

4. Galvanized steel plate is also divided into cold galvanized steel plate and hot plated galvanized steel plate, usually cold galvanized steel plate is easier to rust, and hot galvanized steel plate is not easy to rust.

Second, why will galvanized steel rust

1. The uneven thickness of the galvanized steel sheet is likely to rust, and then drive the thick place, so that the entire galvanized steel sheet will rust.

2. Under normal circumstances, the galvanized steel plate at home is not suitable for being placed in a humid environment, and if the galvanized steel plate is placed in a humid environment for a long time, the galvanized steel plate will rust quickly.

1. The advantages of galvanized steel plate as a flower bed:

Galvanized steel plate as a flower bed has corrosion resistance, reliability, and galvanized steel plate as a flower bed can be good oxidation resistance, durable use, is a very good plate type. The surface oxidation resistance is strong, and the corrosion resistance inside the flower bed can be strengthened.

Galvanized steel plate as a flower bed has the advantages of integrity and maintenance-free, so that every part of the surface of the plating can be well and evenly plated with zinc, even in the depression, sharp corners and hidden places can be fully zinc. The galvanized steel plate is durable and used in the flower bed, and the standardized galvanized rust prevention layer in the outdoor environment can be maintained for 10 years without repair.

2. the shortcomings of galvanized steel plate to do flower beds

When the galvanized steel plate does subsequent processing of the flower bed, it may show linear dark lines on the surface of the board, and there are bumps and obvious tactile feelings in serious cases, sometimes it is not clearly visible, and it is easy to show dark lines or black spots. Therefore, the general galvanized steel flower box will add a layer of high temperature paint, which is not only more beautiful, but also waterproof and rust prevention and a layer of protection.

Galvanized iron pot boiling water is not toxic. Galvanized iron sheet is what we commonly call galvanized iron sheet, galvanized iron sheet is often made into a variety of buckets, basins and kettles.

Iron and zinc are both metallic elements, they do not dissolve in water, with galvanized iron pot boiling water is also drinkable. Zinc and iron are both essential trace elements for the human body, and even if there is a little in water, it is also beneficial to the human body.

However, galvanized sheet in the process of galvanizing, with chemical reactions, it is inevitable that a small amount of harmful substances will be mixed, long-term use of harmful substances will precipitate, and a long time may cause damage to the human body. It is recommended that consumers choose 304 or 316 food set stainless steel kettle for water.

Galvanized iron pot boiling water is not toxic. Galvanized iron kettle is made of sheet iron, even if heating will not change, and there is no harm to the human body, but long-term heating of the kettle inside will produce scale, so it should be dealt with in time.

1. the reliability of galvanized steel plate is good, galvanized layer and steel is metallurgical combination, become a part of the surface, so the durability of the coating is more reliable.

2. galvanized steel plate has corrosion resistance. Galvanized steel plate is to prevent corrosion on the surface of the steel plate to extend its service life, coated with a layer of metal zinc on the surface of the steel plate, this zinc coated steel plate is called galvanized steel plate. Galvanizing is an economical and effective rust prevention method that is often used, and about half of the world's zinc production is used in this process. Galvanized steel plate is an important steel anti-corrosion plate, not only because zinc can form a dense protective layer on the surface of the steel, but also because zinc has a cathodic protection effect, when the galvanized layer is damaged, it can still prevent the corrosion of the iron base material through cathodic protection.

3. galvanized steel coating toughness, galvanized layer forms a special metallurgical structure, this structure can withstand mechanical damage during transport and use.

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① Hot dip galvanized steel plate. The sheet steel is dipped into the melted zinc tank so that the surface is adhered to a zinc sheet steel.

② alloyed galvanized steel plate. This steel plate is also made with hot dip method, but after the trough, immediately heat it to about 500℃, fingerprint resistance galvanized sheet wholesale, so that the generation of zinc and iron alloy coating.

③ Electric galvanized steel plate. The galvanized steel plate made by electroplating has good workability. But the coating is thinner, corrosion resistance is not as good as hot dip galvanized sheet:

④ Single-side plating and double-side difference galvanized steel plate. Single-sided galvanized steel plate, that is, galvanized products only on one side. It has better adaptability than double-sided galvanized sheet in welding, coating, rust prevention and processing.

⑤ Alloy, composite galvanized steel plate. It is made of zinc and other metals such as lead, zinc alloy or composite plating of steel plate.

With the continuous expansion of the use of hot galvanized sheet, the following purposes can be achieved by polishing the strip steel in the modern continuous hot dip galvanizing unit:

(1) Improve the flatness and flatness of the sheet, but also the surface of the zinc particle flattening, so that the surface of the strip smooth, which is especially advantageous for later deep drawing and other occasions with higher precision;

② The polishing roll used has been pre-shot peening, so the surface of the plating plate has a certain roughness after polishing. It can improve the adhesion of the coating, but also can store a certain amount of grease, in the deep drawing process, the lubrication of the die is beneficial;

③ For the plating plate after painting treatment, although the surface is controlled into small zinc flowers, small zinc flowers can still be exposed through the paint layer. Therefore, for some high requirements of galvanized sheet, small zinc flower surface needs to go through polishing treatment. This can make the galvanized sheet obtain a more uniform silver appearance;

(4) By finishing, the lower yield point can be reduced to make the yield platform disappear or less obvious, which can prevent the slip line in the future drawing or deep drawing, and improve the possibility of deep drawing.

The coating thickness formula is: Dz = Gz (Sz*dz), where: Dz -- coating thickness mm, Gz -- per square meter coating weight g, Sz -- coating area mm2, dz -- zinc specific gravity, the above formula can be simplified as: Dz = 0.000139Gz

The causes of white rust are: hot dip galvanizing and other acid, alkali, salt and other corrosive media together; Passivation film or anti-film is destroyed; Passivation or oiling effect is not good; The storage warehouse is not well ventilated and damp; Galvanized sheet in the transport of water; Transported at low temperature and stored at high temperature, condensate is formed.

When the hot galvanized sheet is in the humid air, especially when the air contains SiO2, CO2, NO2 and NO and other acidic substances, the surface of the galvanized layer will soon produce loose white rust. The main components of white rust are ZnO and Zn (OH) 2. This kind of white rust not only affects the appearance, but also brings great difficulties to the future use.

There are three ways to test the corrosion resistance of hot-galvanized sheet: salt spray test; Wet test; Erosion test.

Chromate passivation treatment of galvanized sheet can form passivation film, its chemical reaction formula is as follows: Zn+H2GrO4-ZnGrO2=H2

The trivalent chromium in solution passivation group is insoluble in water, and its chemical properties are not active, which plays the skeleton role, while the hexavalent chromium is easily soluble in water, which can play the role of re-passivation when the passivation film scratches, and has the healing effect of passivation film. Therefore, within a certain limit, passivation film can prevent steam or moist air directly erosion galvanized sheet, zinc layer plays a protective role.

large zinc flower is normal zinc flower, according to the normal production process can produce large zinc flower, its crystal core diameter is not less than 0.2mm; The diameter of the crystalline nucleus less than 0.2mm is called small zinc flower, which is generally not identifiable by the naked eye.

Dark spots are formed by further oxidation of white rust. The main causes of white rust are:

Poor passivation, passivation film thickness is not enough or uneven; No oil on the surface or residual water on the strip surface; The surface of the strip contains water when it is rolled up. Passivation not completely dried; Getting wet or rain-soaked during transportation or storage; The storage time of finished products is too long; Galvanized sheet and other acid and alkali and other corrosive media contact or stored together.

The main reasons for zinc layer shedding are: Surface oxidation, silicon compounds, cold bound emulsion is too dirty, NOF section oxidation atmosphere and protective gas dew point is too high, air fuel ratio is unreasonable, hydrogen flow rate is low, furnace aerobic infiltration, strip into the pot temperature is low, RWP section furnace pressure is low and door suction, NOF section furnace temperature is low, Grease evaporation is not enough, zinc pot aluminum content is low, unit speed is too fast, insufficient reduction, zinc liquid residence time is too short, coating thickness.

Known: the production specification is 0.75×1050mm, and the coil weight is 5 tons. What is the length of the coil? (The specific gravity of galvanized sheet is 7.85g/cm3)

Solution: L = G/ (h×b×p) = (5×1000)/(0.785×1.050×7.5) = 808.816m

Answer: The coil is 808.816m long.

Mainly: peeling, scratches, passivation spots, zinc particles, thick edge, air knife stripes, air knife scratches, exposed steel, inclusion, mechanical damage, poor steel base performance, wave edge, ladling bend, inappropriate size, embossing, zinc layer thickness, roll printing, etc.

There are two kinds: air-cooled and water-cooled.

There are three kinds of vertical, horizontal and vertical annealing furnaces.